What speed should the aircraft accelerate to after taking off if climb obstacles are a concern?

• A. 120 KIAS
• B. 130 KIAS
• C. 140 KIAS
• D. 150 KIAS

Answer: (C)

Accelerating to 140 KIAS after takeoff is a crucial consideration when climb obstacles are present. This speed provides a balance between satisfactory climb performance and the aircraft's ability to maneuver effectively in the event of an emergency. Specifically, 140 KIAS allows for a safe margin above the stall speed, thereby ensuring better aircraft control and performance during the critical phase of departure.

When navigating around obstacles, maintaining this speed enhances the potential climb rate needed to clear these obstacles safely. It also accounts for any variations in weight and configuration, ensuring that pilots have sufficient thrust for climbing while also preserving adequate airspeed for positive control and responsiveness.

Selecting this speed supports a robust climb profile, reducing the likelihood of encountering performance issues that could arise from inadequate speed, especially in the initial moments post-takeoff when the aircraft is most vulnerable to obstacles.